Sometimes you have no choice. Under Linux, for once: I'm loving it, but I loathe FireFox which is still the only decent browser I've come across there (but then, I'm only a recent convert = noob in Unixland). Under Windows, my favourite was Safari, with IE 7 second. But Safari under Wine isn't pretty.
Also, accoring to <a href="http://www.en.rankings.hu/" rel="nofollow">http://www.en.rankings.hu/</a> Firefox 2.x is the most used web browser version in Hungary. (Although IE6 + IE7 combined are still way beyond 50%.)